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    <title>Document</title>
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    <script>

        // try catch   尝试执行代码，假如报错就捕获错误 --- 不让程序报错

        const str = '[1,2,3' ;

        // const res = JSON.parse(str) ;

        // console.log(res);

        try {
            const res = JSON.parse(str) ;
            console.log(res);
        } catch(err) {
            // console.log(err);
        }

    </script>
    
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